UDMA66 what is it?

  [DELETED] 18:39 24 Sep 2003


I've got Tweak-XP installed and there's an option in the hardware section that enables UDMA66 on the HDD. But it says you have to make sure that the HDD is UDMA66 compatable or else you may have to reinstall Windows.

Is UDMA66 the same as Ultra DMA mode 5?

if not then what is it? and how do find out if my drive is compatable? I brought the drives within the past 12months.

The reason why i'm considering this is becuase my computer has been playing up lately. When i turn it on it gets to the WindowsXPpro splash screen and then just stays there. The blue bar under the logo that moves from left to right keeps moving. I've left it at times for about 20mins and it still there. I normally just press the reboot button and it works fine manages to reach the desktop. However today i had to restart 5 times and even then it didn't get to the desktop i had to reboot again and go into BIOS to make sure the settings were right, which they were, and then boot exit BIOS when it managed to get to desktop then.

Can anyone offer any advice or answers? I did scandisk some time ago when i 1st noticed this problem and it came out fine, no lost clusters or anything.


  [DELETED] 18:46 24 Sep 2003

ATA (or UDMA) 100 is Mode 5.

ATA (or UDMA) 66 is Mode 4.

If your HDD is Mode 4 or 5 then enable UDMA66.

  [DELETED] 18:48 24 Sep 2003

isn't UDMA100 better than UDMA66?

  [DELETED] 18:51 24 Sep 2003

And what about UDMA 133?

  [DELETED] 18:51 24 Sep 2003

Yes. But the feature you'll switch on benefits UDMA 66 drives & above - so i believe.

  [DELETED] 18:53 24 Sep 2003

Yes it's faster UDMA100 =100Mbps transfer rate: Udma66 = 66Mbps transfer rate.

  [DELETED] 18:54 24 Sep 2003

so if my HDD is even UDMA133 and i put it down to UDMA66 then it'll make it slower.

  [DELETED] 18:56 24 Sep 2003

so i know that my drive is 133. ok thats fine.

Can anyone give any advice about the start up problem?

  [DELETED] 20:38 24 Sep 2003

Make sure that you have 80 wire IDE/ATA cables to obtain the higher data transfer rates, otherwise the drives will run at slower speeds.

  [DELETED] 21:21 24 Sep 2003

It is the transfer rate of data through the IDE bus and TBH a UDMA 100 drive probably isnt any slower running at UDMA 66 as it can only muster maybe 35MBs actual data transfer.

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